Quick Answer. A low hemoglobin count, also known as anemia, is caused by pregnancy, a menstrual period, a diet low in iron, blood loss, or a disease that causes the body to produce fewer red blood cells or to destroy red blood cells. According to the Mayo Clinic, medications also sometimes cause anemia.
A cytotoxic T cell (also known as TC, cytotoxic T lymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+ T-cell or killer T cell) is a T lymphocyte (a type of white blood cell) that kills cancer cells, cells that are infected (particularly with viruses), or cells that are damaged in other ways.
T cell. Definition. noun, plural: T cells. A type of white blood cell that functions in cell-mediated immunity, and is distinguished from other types of lymphocytes by the presence of special receptor (T cell receptor) on the cell surface. Supplement. The T in T cell stands for thymus. The thymus is the bodily organ where T cells mature.